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Standard Automated Dip Coating & Drying Systems

Glenro designs and manufactures conveyorized machines that vertically dip coat and submerge printed circuit boards into protective conformal coatings and then dry the coatings. One machine: one continuous process: one operator.

Dip coating both sides of the product at the same time promotes high-quality encapsulation of the components and increases through-put. Dip coating eliminates the need for complicated material handling systems, multiple operators, and avoids the high maintenance of spray coating equipment. End users are attracted to the idea of dip coating their boards, as compared to spray coating because dip coating reduces the overall cost of manufacturing. Very little coating is wasted and specified coating thicknesses required to protect the boards against the end-use environment in which they are designed to operate can be applied and dried in one pass through the machine. Dip coating with set-point viscosity control puts the user back in control of the commercially available conformal coatings and allows operators to extend the coverage areas per gallon purchased.

Fire Suppression System, designed in accordance with the National Fire Protection Association, Pamphlet No. 12

Dip Tank Nitrogen Purge Blanket, which includes a tank cover with fitting for connection to a remote N2 supply to deter coating evaporation when the equipment is not in use.

Model 4124

Model 4124 is an automated vertical conveyorized dip coat and infrared drying system. The conformal coating machine is capable of handling a working part area up to 20 inches wide and 10 inches in the dip direction. A typical production rate for this machine, given a 6 inch square board would equal 72 boards per hour at a conveyor speed of 4 inches per minute.

This standard design comes preassembled and wired. It includes a dip tank and an overflow reservoir with liquid level control to +/- 50 mils, recirculation-filtration system, infrared dryer, ventilation equipment, driven conveyor and a control system.

The machine illustrated was also equipped with a controlling viscometer and fire suppression system.

Standard Model 4124 Process Flow

Glenro conformal coating machines are compact, easy to use and can be operated by one person saving floor space and labor costs. There is no complicated handling between coating and drying to slow line speed or increase costs.

Load - The operator hangs the printed circuit boards on a stainless steel cross bar which is supported by a roller chain conveyor.

Dip Coat - The conveyor lowers the products into the stainless steel dip tank where both sides are coated simultaneously.

Withdraw & Flow-out - The conveyor then withdraws the boards at a controlled, constant rate that can be adjusted to achieve the desired coating thickness.

Dry - The coated pieces are carried upward to the drying section, where both sides are dried at the same time.

Unload - The finished pieces are returned to the point of entry for removal.

The dip coater system is supplied with pressurized, filtered air to maintain clean manufacturing conditions. The exhaust system is designed to remove heated vapors and air, as well as heavier-than-air solvent vapors from the bottom of the machine. The conveyor drive is speed controlled from 2 to 20 inches per minute.

The infrared drying section includes four Glenro Radplane® Series 36 low-temperature infrared heaters and a temperature control system. The heating section is controlled in one zone. Total connected heater power is 6 kW. Aluminum reflectors keep the heat in the processing zone for greater energy efficiency and personnel safety.

Controls are housed in a NEMA 12 enclosure for remote location relative to the automated machine.

Model 4246

Glenro Model 4246 is designed to dip coat printed circuit boards in protective conformal coatings, and then dry the conformal coatings in one operation using one operator. A typical production rate for this machine, given a 6 inch square PCB would equal 144 boards per hour running 4 inches per minute.

This standard design comes preassembled and wired. It includes a dip tank and an overflow reservoir with liquid level control to +/- 50 mils, recirculation-filtration system, infrared dryer, ventilation equipment, driven conveyor and a control system.

The system illustrated was also equipped with a controlling viscometer and fire suppression system.

Standard Model 4246 Process Flow

This side view schematic shows Model 4246. Note that there is a long flow-out zone between the dip tank and the infrared drying section. There are six infrared heaters in the drying section. This makes the system especially effective for high volume applications.

Load - The operator hangs the printed circuit boards on a stainless steel cross bar which is supported by a roller chain conveyor.

Dip Coat - The conveyor lowers the products into the stainless steel dip tank where both sides are coated simultaneously.

Withdraw & Flow-out - The conveyor then withdraws the boards at a controlled, constant rate that can be adjusted to achieve the desired coating thickness. This section of conveyor is lengthened to extend the flow out time of the coating prior to entering the dryer section.

Dry - The coated pieces are carried upward to the drying section, where both sides are dried at the same time. This model includes an extended heated length to provide more infrared drying time.

Unload - The finished pieces are returned to the point of entry for removal.

The dip coater system is supplied with pressurized, filtered air to maintain clean manufacturing conditions. The exhaust system is designed to remove heated vapors and air, as well as heavier-than-air solvent vapors from the bottom of the machine. The conveyor drive is speed controlled from 2 to 20 inches per minute.

The infrared drying section includes six Glenro Radplane® Series 36 low-temperature infrared heaters and a temperature control system. The heating section is controlled in one zone. Total connected heater power is 18 kW. Aluminum reflectors keep the heat in the processing zone for greater energy efficiency and personnel safety.

Controls are housed in a NEMA 12 enclosure for remote location relative to the automated machine.